Besides the two different methods for adjusting, YBlocks also had two different ratios. 57 had the high ratio rockers. I think that the different methods of adjustment pertain to different years, not different models. I don't remember which years had which.
The correct rocker for 57 had ECG-6564 A2 (or B2) for a casting number. These were the high ratio ones. The low ratio ones had just a number of 6 or 7 digits The only place I know where to get the correct rockers is John Mummert 619-596-0312. John can tell you what years had which method of adjustment.
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Originally Posted by Irvine47
I purchased our 57 and went to adjust the valves and one side had the rockers that you use a screw driver and a lock nut and the other side was the one you use a wrench on. One of my friends told me that the 312 rockers for the Thunderbird was different than what the Ford passenger car had, is this true? May I ask what the part # is for the correct Thunderbird rocker?
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